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86 Chapter 3

Basic Digital Operation

Local Settings for ARB Waveform Formats and the Dual ARB Player

SCPI Command Changes

New SCPI commands have been developed for the C.03.10 firmware release that lets you set

the three parameters discussed earlier for each ARB modulation format and the dual ARB

player. Commands have also been changed for the three parameters in the Digital Modulation

subsystem to accommondate the local setting feature. The new commands behave similar to

the softkeys discussed in the previous section. The main difference is that you can set new

values for the three parameters that reside in the I/Q and/or mux menus while an ARB

modulation format is active, however the new settings will not be applied to the signal

generator until the ARB format is turned off. Then they are used only if a real-time

modulation format is turned on or an external I/Q signal is applied to the ESG.

The pre-C.03.10 Digital Modulation subsystem filter and attenuator commands will still work

implementing the same behavior, in that they apply changes globally. This means that if you

had implemented a local setting for an ARB format using the new commands, and then

executed the older commands from the Digital Modulation subsystem, the older commands

would override your local settings.

ARB Sample Clock

Each ARB modulation format and the dual ARB player incorporate a local ARB sample clock

parameter. For example, you can set the ARB cdma2000 modulation format’s ARB sample

rate to 5 MHz, and this parameter would apply only to the ARB cdma2000 waveform that is

currently playing. The 5 MHz setting would not be reflected in any of the other ARB

modulation formats or the dual ARB player. If you were to turn-off the cdma2000 ARB format

and then turn it back on, the factory setting would be applied until you once again change the

ARB sample clock value. This setting can be saved to the header file. In this way you can set

the ARB sample clock while in the ARB modulation format, and have that same setting

applied when the waveform is selected for play-back in the dual ARB player.

The accessibility and setting of the ARB sample clock differs between the ARB modulation

formats and the dual ARB player. Within the ARB formats, this parameter can be changed

only when the format is active (on). Any value you enter while the format is active, will be

replaced with the factory optimized value when the format is turned off and then back on.

While the ARB format is off, the

ARB Sample Clock softkey is grayed-out. In the dual ARB

player, the ARB sample clock setting is accessible even when the dual ARB is off. You can also

set the ARB sample clock while it is off and the new setting is applied when the dual ARB

player is turned on. This setting will survive toggling the dual ARB player off and on.

Figure 3-12 on page 85 shows the location for the

ARB Sample Clock softkey which is on the

first page of the

ARB Setup softkey menu. Even though the figure is for the ARB W-CDMA

modulation format, the key path is the same for all ARB formats and the dual ARB player.

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Agilent Technologies ESG Guía de usuario Pagina 102